#define  _CRT_SECURE_NO_WARNINGS  1
#include<stdio.h>
int main()
{
    int n = 0;
    scanf("%d", &n);
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (i == 0 || i == (n - 1) || j == 0 || j == (n - 1))
            {
                printf("* ");
            }
            else
            {
                printf("  ");
            }
        }
        printf("\n");
    }
    return 0;
}